Airtac SCJ40 Standard Cylinder SCJ40X75-20S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X75-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø40mm bore, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke75 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X75-20S
The SCJ40X75-20S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. Its rear-cap screw provides up to 20 mm of fine-tuning, letting you dial in the exact stroke position during commissioning or changeovers without swapping the cylinder. At 0.5 MPa, it delivers 628 N of push force and 528 N on the pull stroke, suiting it for medium-light clamping and positioning tasks.
This model includes a built-in magnet (-S suffix), so standard CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for end-of-stroke detection. The 40 mm bore uses a 16 mm piston rod, PT1/4 ports, and a 21 mm air cushion. With an SCJ body length of 185 mm, it fits where space is tight but adjustable end-position control is required.
Airtac SCJ40 Standard Cylinder SCJ40X75-20S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X75-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 75 mm |
| Stroke adjustment | Up to 20 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
Model Code: Airtac SCJ40 Standard Cylinder SCJ40X75-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×75 | Nominal (maximum) stroke length in mm. |
| -20 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Where the Airtac SCJ40 Standard Cylinder SCJ40X75-20S Is Used
End-Stop Fine-Tuning
Adjust the rear screw to compensate for tooling wear or part tolerance drift, maintaining consistent contact without reprogramming the controller.
Format Changeover Stops
Quickly reset the stroke end for different product sizes on a packaging line, reducing changeover time compared to swapping fixed-stroke cylinders.
Sensor-Controlled Sequencing
The built-in magnet allows CMSG sensors to confirm the piston has reached the adjusted end position, enabling reliable interlocking in automated assembly cells.
Is the Airtac SCJ40 Standard Cylinder SCJ40X75-20S the Right Cylinder?
Choose the SCJ40 when you need to fine-tune the stroke end by up to 20 mm on the machine. If the 628 N push force at 0.5 MPa is marginal, stepping up to the SCJ50 bore provides 982 N push. For applications that do not need stroke adjustability, the fixed-stroke SC40 is a simpler, cost-effective alternative. This cylinder is a direct replacement for another AirTAC SCJ40X75-20S with a PT port, basic mount, and magnet.
At a 75 mm nominal stroke, rod deflection under side load is minimal, but if the load is not guided, consider adding an external linear guide. The built-in magnet eliminates the need for external trip flags, simplifying sensor mounting for sequence control.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ40 Standard Cylinder SCJ40X75-20S FAQ
At the standard operating pressure of 0.5 MPa, it generates 628 N of push force and 528 N of pull force. The maximum push force at 0.9 MPa is 1130 N. The adjusting screw does not alter the force output.
Yes, if you need field-adjustable stroke end control. The SCJ40X75-20S shares the same 40 mm bore, PT1/4 ports, and basic mounting footprint as the SC40 series, but adds a rear adjusting screw. Ensure the 20 mm adjustment range suits your application.
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